There's a loss of pressure somewhere in the Dual Power/PTO/MFWD clutch circuits. They are all supplied by a second pump section on the rear of the main pump with the pressure regulator in the PTO control valve. Your first step is to get a 300 psi pressure gauge and get it fitted to the tractor. If it's got a newer pump it will have a 1/8" NPT plug in the manifold of the pump that leads to the DP/FWD clutch supply lines on the bottom of the pump. If it doesn't have that plug you will need to tee into the DP supply line to get the pressure reading. What you do from there is test with the engine operating at a fast idle... you want 160-180 psi although 150 is probably fairly normal. You test with the DP in high, then low... with the PTO engaged, then disengaged and then with the MFWD engaged and disengaged. Try all various combinations. If a 10% or more loss of pressure is observed in one of those variations that is not observed otherwise then you can assume that there is a leak in said circuit when it's engaged. You will also notice pressure dips when something is shifted but it should recover momentarly. You should also look at the pump body to the rear of the main filter... you will see a plastic square plug. This is the strainer/filter for the PTO pump section. Remove this and clean it. At this point you're probably going to find a LOT of crap in the oil. If it's been run this way for a long time then you're probably looking at a major teardown to reline the DP, the mfwd and PTO clutches... and clean the accumulated buildup of filings and clutch material. It's also possible that if the brakes are worn down that their material has contaminated the oil to the point that it's blocking the intake strainer continously... If it's got a system wide loss of pressure look directly to the strainer. If it's got no pressure period it may also have a sheared spline on the PTO drive hub at the flywheel. Remember, pressure test FIRST. THIS IS THE SINGLE MOST IMPORTANT STEP YOU WILL TAKE IN THIS REPAIR.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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